I currently own the Linhof 617S with Schneider 90/5,6 and I just love it.

BUT!

I'm thinking of selling it to buy a cheaper model and I've been looking at either the Dayi or Gaoersi models. But what do I lose if I buy one of theses models compered to the Linhof?

Also a lens question:

The Schneider optics require a center filter (whitch I have) but from what I've heard the Nikkor 90/4,5 (maybe the 90/8 aswell?) doesn't require this, is that correct?


Thanks!